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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c04a5c480cc4dbf99be616480c93505b4d6de65d37efed8df14a6b599714f382' 
  AND token = 'Vbhz8p7B3Q9RAKnHN7pRHTDotRPFe5kY3nz8WCVS/88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}